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There might be some misunderstanding here. however, I did not see anyone is arguing just for the sake of argument. I think fantadox might have asked some questions not in the totally straightforward way. But I think Xing1 Kong1 is not answering the real question either.
The reason for which plane-wave, or simple harmonic oscillator, expansion is very useful has nothing to do with the fact that it is beautiful. It is useful because most system we know are very weakly coupled, if not exactly free (or linear). Therefore, free states form a good basis for perturbation theory. We also have plenty of examples where the good basis to start is not plane-wave, since in this basis the system will be strongly coupled. For example, in AdS space with boundaries, the right basis to start is Bessel functions.
Therefore, whether plane-wave is more fundamental really depends on what system you are studying and what you mean by fundamental. |
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